Container



Sept 27 l949- G. s. v|v|AN 2,483,162

CONTAINER n Filed out.v 9. 1945 IN VEN TOR.

GEORGE $1' wART VIV/AN BMM H TTORNE Y Patented Sept. 27, 1949 CONTAINER George Stewart Vivian, Surbiton,

England, as-

signor to Satona Limited, Edinburgh, Scotland,

a. British company Application October 9, 1945, Serial No. 621,251 Z Claims. (Cl. 229-57) This invention relates to improvements in containers and particularly to a closure for the bottom of a polygonal container manufactured from cardboard or other suitable sheet material by a folding operation.

It has been proposed heretofore to provide polygonal containers made of cardboard and the like with bottom closures formed by folding It would be desirable to have the cover sheet contact all of the folder surfaces to increase the strength of the seal.

Further, such prior cloverleaf closures are characterized by having a very great unevenness in thicknessthat is, as one rotates the closure the thickness is one layer, then three layers, then one layer, then three layers, and so forth. Where the two layers terminate there is always a very pronounced non-uniformity, which makes it diiicult to obtain proper adhesion to the covering sheet material. This results in a relatively irregular and uneven bottom.

'I'he main object of the present invention is to provide for a container with a rigid and closed bottom.

Another object of the invention is to provide a bottom closure container by bending or folding cardboard or other suitable sheet material which will be leakproof and strong.

Still another object of the invention is to provide a container of cardboard or other suitable sheet material for liquids, semi-liquids and powdered or granulated materials.

According to the present invention, there is provided a polygonal container formed of cardboard or the like having a bottom closure formed by folding over the lower portions of the Walls of the container, the folded over portions being so arranged that the bottom comprises alternating sections of three, two and one layers and a separate piece of sheet material secured to the outer side of the bottom and adapted to hold the folded parts in a folded position and to seal the bottom.

In the drawing forming part of this application:

Figure 1 represents in a reduced scale a plan 2 view of a piece of sheet material disclosing the container in unfolded position.

Figure 2 is a perspective view of the bottom part of the container with the folded bottom.

Figure 3 is a plan view of the bottom closing piece of sheet materia Figure 4 is a perspective view of the finished bottom with the bottom closing piece in place.

The container forming the present invention is made from two pieces of cardboard or similar sheet material as disclosed in Figure 1 and Figure 3.

The main rectangular piece according to Figure 1 is provided with vertical weakening lines III and a horizontal weakening line |I, subdividing the piece into container side portions I 2, I3, I4, and I5, bottom forming portions I6, I'I, I8, I9,l and an extension 20. The breadth of the bottom forming portions I6, I1, I8, and I9 is not greater than one-half of the distance between two vertical weakening lines I0. The bottomforming portions I6, I'I, I8, and I9 are precreased along lines 2| subdividing them into triangles 22, 23, 24 and 25.

The bottom-forming portions may also be precreased along lines 2|', which meet the lines 2| at the middle of the outer edge 29 of the bottom portion (though this precreasing along the lines 2|' is not strictly necessary). 'I'he bottomforming portions are also cut away along the lines 30 and II), the line 30 beginning at a point between, preferably half-way between lines II and the outer edge 29 and terminating at the apex of the triangle formed by lines 2| and 2|'. Thus, triangular sections 3|, 32, 33, and 34 are out completely away from the bottom-forming sections. Thus, each bottom-forming portion of each panel can be considered as comprising three triangles; for example, the triangles 6, 22 and 46, which are integral with the sidewall I2. The triangle 22 is integral with the adjacent triangle 41.

The other end of the carton blank may be o pre-creased as desired to form any desired type 0f top closure. Merely by way of illustration but not by way of limiting the invention, the blank may be pre-creased along the transverse lines 35 and 36 and the panels I3 and I5 maybe precreased along the lines 3'I and 38 so that the top may be formed by inwardly depressing the top portions of the panels I3 and I5 and folding down and flattening the top portions of panels I2 and I 4 on the inwardly folded panels to form a closure of the pitched roof type, all of the flattened sections being sealed at the top to form an upstanding ridge C as shown in Figure 2.

The piece of cardboard or similar sheet materia-l according to Figure l is folded along the pre-creased lines I to form a rectangular hollow body 26 (Figure 2) and the extension 20 is united with the adjacent side portion I2 by gluing or otherwise. When the rectangular hollow body 28 is formed, the bottom-forming sections IS, I1, I8, and I9 are folded into bottom-forming position along the pre-creased line Il, and at the same time the triangles 22, 23, 24, and 25 are folded along the pre-creased lines 2|, thus covering a part of their respective bottom-forming portions I6, I'I, I8, and I9.

When the bottom-forming portions have been folded as shown in Figure 2, it will be noted that the triangularsections 46, 41, 4B, and 49 therelor, respectively do not fully cover the underlyingfolded section so that triangular sections 40, 4I, 42, and 43 are left exposed. These exposed surfaces (which iorm part of triangles 22, 23, 24, and 25 respectively) can therefore make direct contact with the superimposed sealing sheet 28 shown in Figure 3.

It will thus be apparent that traversing the bottom in clockwise direction that the bottom comprises alternate sections consisting of, first, a single layer, then two superimposed layers, and then three superimposed layers. For example, the single layer comprises the single thickness of the bottom section comprising the triangle I9; the double layer consists of the triangle 40 which is superimposed upon the triangle i9, while the third layer comprises the section 46. Thus it will be apparent that traversing the bottom in clockwise direction that at no place 0n the bottom is there any discontinuity comprising more than a single edge of sheet material. This greatly facilitates sealing of the overlying sheet 28 and provides a more uniform bottom structure. In view of the radiating triangles forming the bottom closure of the present invention it may be called a rosette closure because the bottom comprises eight, instead of four, substantially equal triangles radiating from the center and four other triangles of equal size.

In order to obtain a rigid bottom and to keep the bottom-forming parts in folded position and to close the opening 21 in the bottom, a bottomclosing piece 28 as Shown in Figure 3 is secured to the outer side of the bottom by means of glue, wax, resin, or suitable adhesive as shown in Figure 4. 1t is preferable to provide the bottomclosing piece 28 with adhesive and to press the piece 28 against the bottom.

Parailln wax may be used as adhesive when the container is made of cardboardor brous sheet material which is impregnated with this wax. The impregnation of the container and the securing of the bottom-closing piece to the bottom may be carried out in one operation.

The shape of the bottom-closing piece 28 need not be rectangular. It can be circular or oval, thus covering only a part of the bottom.

The container may be made of cardboard, paper, metal foil or a foldable plastic sheet material such as a resin or an organic cellulose derivative, If the materials are heat-scalable, the sealing of the bottom closure may be effected by heat and pressure.

Having described my invention, what I claim l as new and desire to secure by United States Letters Patent is:

1. A container blank comprising a sheet o f foldable material comprising four rectangular substantially equal-sized panels adapted to form the sidewalls, al1 of said panels being provided at the same end with integral bottom-forming extensions, said extensions having a length substantially equal to one-half the width of said sidewall panels, each of said bottom-forming extensions having a triangular section cut away, said cut-away section ybeing dened by a line drawn from a point positioned half-way up the side of said extension and terminating at a point in the middle of the outer edge of said extension whereby the said extensions are folded in overlapping relation to form a bottom closure.

2. A container according to claim 1 in which the bottom closure comprises extensions of the side walls disposed in overlapping relation, and a separate piece of sheet material secured to the outer side of the bottom closure thus formed.

f GEORGE STEWART VIVIAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 801,579 Flora et al. Oct. 10, 1905 1,472,211 Gallistel Oct. 30, 1923 2,013,691 Martinson Sept. 10, 1935 2,047,804 Shapiro July 14, 1936 2,091,291 Ringler Aug. 31, 193'? FOREIGN PATENTS Number Country Date 473,897 Great Britain Oct. 21, 1937 

